as far as I know, the golf course between the runways isn't easily accessible for civilians. If anyone knows how to get there, that information would be much appreciated !
There are, however, two viewing decks behind glass in terminal 1, with only mildly tinted glass. They are on the forth floor and, until about 2 years ago, were connected by the long Thai Food Court. The Food Court has since closed, but maybe something new has opened meanwhile.
The view you have from up there is into the yard between gates 31-37 on your right and 20-26 on your left. Your view is also on the main taxiway leading to 21R/21L departures, and you will need approximately 180mm for a passing A330. Due to the north/south orientation of buildings and runways at BKK
, photography is only good in the afternoon.